Over its more than 10-year deployment, some 187 peacekeepers have lost their lives.

However, it is not the casualty toll that is driving the UN out of Mali. It is the country's military regime that is insisting the 12,000 international troops must depart - despite a desperate security crisis that shows no sign of fading away.

Once the UN peacekeepers have departed, Mali will be even more dependent on the Russian mercenary Wagner group, which is thought to have 1,000 fighters in the country, for security back-up.
...
The recent falling out between Russia President Vladimir Putin and Yevgeny Prigozhin, the leader of the mercenary outfit, may raise questions about the exact arrangements under which these forces are deployed.

https://www.bbc.co.uk/news/world-africa-66051450